Telcordia Technologies

About: Telcordia Technologies is a based out in . It is known for research contribution in the topics: Network packet & Node (networking). The organization has 3097 authors who have published 4737 publications receiving 237882 citations.

System, method, control device and program for vehicle collision avoidance using cellular communication

Abstract: Avoiding vehicle collisions using an in-vehicle device is provided. The method comprises receiving a connection request from an in-vehicle device within a moving vehicle when the moving vehicle is within a selected distance from a traffic intersection, establishing connection with the in-vehicle device within a moving vehicle via a serving base station, receiving position information from the in-vehicle device within a moving vehicle corresponding to a position of the moving vehicle, receiving control information for a traffic light at the traffic intersection from a traffic management center and relaying the control information for the traffic light to the in-vehicle device within a moving vehicle. A warning is issued based upon a vehicle speed, a location and a position relative to a traffic intersection. A warning is also issued based upon multiple vehicles speed, relative locations to each other and each position relative to a traffic intersection.

Finding tailored partitions

Abstract: We consider the following problem: given a planar set of points S, a measure m acting on S, and a pair of values m1 and m2, does there exist a bipartition S = S1 U S2 satisfying m(Si) ≤ mi for i = 1,2? We present algorithms of complexity O(n log n) for several natural measures, including the diameter (set measure), the area, perimeter or diagonal of the smallest enclosing axes-parallel rectangle (rectangular measure), and the side length of the smallest enclosing axes-parallel square (square measure). The problem of partitioning S into k subsets, where k ≥ 3, is known to be NP-complete for many of these measures.

Telecommunication network trouble recovery system

Abstract: Rapid restoration of a telecommunication path between network nodes after an interrupting network link failure utilizes a distributed system of selective flooding for dynamically reconfiguring the internodal path in a manner which will ensure the most economical use of intermediate links. A help message transmitted from one of the terminating nodes to each contiguous neighboring node requests use of the uncommitted bandwidth of each respective link. This wave of messages is propagated selectively, along paths having maximum available bandwidth and least number of links, through the network by each successive receiving node until the help message reaches the other terminating node of the failed link. An acknowledgement message returned to the initial terminating node via propagation links offering the maximum bandwidth establishes a reconfigured path providing the greatest bandwidth recovery. In the event that such a path does not completely satisfy the original bandwidth requirement, additional paths are established by successive waves of request messages until the balance of the requirement is met.

Electrical cable arcing fault detection by monitoring power spectrum in distribution line

Abstract: A system for detecting arcing faults in DC electrical cable power distribution circuits, typically in telecommunications networks, monitors the power spectrum of distribution lines over a frequency band of about 4 Hz to 5 KHz in which current surges characteristic of arcing line faults have been found to occur. The system compares power levels in this detection band with a threshold level typical of normal communications traffic and registers an alarm condition when an excess indicative of arcing is detected.